So basicly I was working on my now tv box. It was connected to my laptop by usb and also plugged in to the mains but the switch was off. My partner turned on the plug by accident and after about 5 seconds my laptop make a short beep and shut down. Now the power light comes on and it recognised the charger was plugged in bit the screen does nothing. I've done all the basics with reseating the ram, taking the battery out and hard reset but still nothing. Any help would be greatly appreciated